Periodic Table Element Comparison: Compare Elements - Helium vs Cesium

Compare Helium and Cesium

Compare Helium and Cesium on the basis of their properties, attributes and periodic table facts. Compare elements on more than 90 properties. All the elements of similar categories show a lot of similarities and differences in their chemical, atomic, physical properties and uses. These similarities and dissimilarities should be known while we study periodic table elements. You can study the detailed comparison between Helium vs Cesium with most reliable information about their properties, attributes, facts, uses etc. You can compare He vs Cs on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more.

Name	Helium	Cesium
Atomic Number	2	55
Atomic Symbol	He	Cs
Atomic Weight	4.002602	132.90545
Phase at STP	Gas	Solid
Color	Colorless	Silver
Metallic Classification	Noble Gas	Alkali Metal
Group in Periodic Table	group 18	group 1
Group Name	helium family or neon family	lithium family
Period in Periodic Table	period 1	period 6
Block in Periodic Table	p -block	s -block
Electronic Configuration	1s2	[Xe] 6s1
Electronic Shell Structure (Electrons per shell)	2	2, 8, 18, 18, 8, 1
Melting Point	0 K	301.59 K
Boiling Point	4.22 K	944 K
CAS Number	CAS7440-59-7	CAS7440-46-2
Neighborhood Elements	Neighborhood Elements of Helium	Neighborhood Elements of Cesium

History	The element Helium was discovered by P. Janssen and N. Lockyer in year 1868 in Sweden and United Kingdom. Helium derived its name from the Greek word helios, meaning 'sun'.	The element Cesium was discovered by R. Bunsen and R. Kirchhoff in year 1860 in Germany. Cesium derived its name from the Latin caesius, meaning 'sky blue'.
Discovery	P. Janssen and N. Lockyer (1868)	R. Bunsen and R. Kirchhoff (1860)
Isolated	W. Ramsay,T. Cleve, and N. Langlet (1895)	C. Setterberg (1882)

Abundance in Universe	230000000 / 72000000	0.8 / 0.01
Abundance in Sun	230000000 / 74000000	8 / 0.07
Abundance in Meteorites	- / -	140 / 20
Abundance in Earth's Crust	5.5 / 30	1900 / 290
Abundance in Oceans	0.0072 / 0.011	0.5 / 0.023
Abundance in Humans	- / -	20 / 1

Atomic Volume	22.4136 cm3/mol	70.732 cm3/mol
Atomic Radius	31 pm	298 pm
Covalent Radius	32 pm	225 pm
Van der Waals Radius	140 pm	343 pm
Atomic Spectrum
Lattice Constant	424.2, 424.2, 424.2 pm	614.1, 614.1, 614.1 pm
Lattice Angle	π/2, π/2, π/2	π/2, π/2, π/2
Space Group Name	Fm_ 3m	Im_ 3m
Space Group Number	225	229
Crystal Structure	Face Centered Cubic	Body Centered Cubic

Atomic Number	2	55
Number of Electrons (with no charge)	2	55
Number of Protons	2	55
Mass Number	4.002602	132.90545
Number of Neutrons	2	78
Shell structure (Electrons per energy level)	2	2, 8, 18, 18, 8, 1
Electron Configuration	1s2	[Xe] 6s1
Valence Electrons	1s2	6s1
Oxidation State	-	1
Atomic Term Symbol (Quantum Numbers)	1S0	2S1/2
Shell structure

Known Isotopes	3He, 4He, 5He, 6He, 7He, 8He, 9He, 10He	112Cs, 113Cs, 114Cs, 115Cs, 116Cs, 117Cs, 118Cs, 119Cs, 120Cs, 121Cs, 122Cs, 123Cs, 124Cs, 125Cs, 126Cs, 127Cs, 128Cs, 129Cs, 130Cs, 131Cs, 132Cs, 133Cs, 134Cs, 135Cs, 136Cs, 137Cs, 138Cs, 139Cs, 140Cs, 141Cs, 142Cs, 143Cs, 144Cs, 145Cs, 146Cs, 147Cs, 148Cs, 149Cs, 150Cs, 151Cs
Stable Isotopes	Naturally occurring stable isotopes: 3He, 4He	Naturally occurring stable isotopes: 133Cs
Neutron Cross Section	0.007	29
Neutron Mass Absorption	0.00001	0.0077

Valence or Valency	0	1
Electronegativity	-	0.79 Pauling Scale
Electron Affinity	0 kJ/mol	45.5 kJ/mol
Ionization Energies	1st: 2372.3 kJ/mol 2nd: 5250.5 kJ/mol	1st: 375.7 kJ/mol 2nd: 2234.3 kJ/mol 3rd: 3400 kJ/mol

Density	0.0001785 g/cm3	1.879 g/cm3
Molar Volume	22.4136 cm3/mol	70.732 cm3/mol
Elastic Properties
Young Modulus	-	1.7
Shear Modulus	-	-
Bulk Modulus	-	1.6 GPa
Poisson Ratio	-	-
Hardness - Tests to Measure of Hardness of Element
Mohs Hardness	-	0.2 MPa
Vickers Hardness	-	-
Brinell Hardness	-	0.14 MPa
Electrical Properties
Electrical Conductivity	-	5000000 S/m
Resistivity	-	2e-7 m Ω
Superconducting Point	-	-
Heat and Conduction Properties
Thermal Conductivity	0.1513 W/(m K)	36 W/(m K)
Thermal Expansion	-	-
Magnetic Properties
Magnetic Type	Diamagnetic	Paramagnetic
Curie Point	-	-
Mass Magnetic Susceptibility	-5.9e-9 m3/kg	2.8e-9 m3/kg
Molar Magnetic Susceptibility	-2.36e-11 m3/mol	3.72e-10 m3/mol
Volume Magnetic Susceptibility	-1.05e-9	0.00000526
Optical Properties
Refractive Index	1.000035	-
Acoustic Properties
Speed of Sound	970 m/s	-

CAS Number	CAS7440-59-7	CAS7440-46-2
RTECS Number	RTECSMH6520000	RTECSFK9225000
DOT Hazard Class	2.2	4.3
DOT Numbers	1963	1407
EU Number	-	-
NFPA Fire Rating	0	-
NFPA Hazards	-	Water Reactive
NFPA Health Rating	1	-
NFPA Reactivity Rating	0	-
AutoIgnition Point	-	-
Flashpoint	-	-

Periodic Table Element Comparison: Compare Elements - Helium vs Cesium

Compare Helium and Cesium

Facts

History

Presence: Abundance in Nature and Around Us

Crystal Structure and Atomic Structure

Atomic and Orbital Properties

Isotopes and Nuclear Properties

Chemical Properties: Ionization Energies and electron affinity

Physical Properties

Elastic Properties

Hardness - Tests to Measure of Hardness of Element

Electrical Properties

Heat and Conduction Properties

Magnetic Properties

Optical Properties

Acoustic Properties

Thermal Properties - Enthalpies and thermodynamics

Enthalpies

Regulatory and Health - Health and Safety Parameters and Guidelines

Compare With Other Elements

Compare Helium with all Group 18 elements

Compare Helium with all Period 1 elements

Compare Helium with all Noble Gas elements

Compare Cesium with all Group 1 elements

Compare Cesium with all Period 6 elements

Compare Cesium with all Alkali Metal elements